Testing version: Version 1.0 (362), macOS 10.13.6
What were you doing: Changing heading number
What feature did you use: Headings
What happened: Visible slowness and rendering artifacts compared to Bear
What did you expect to happen: The same performance as Bear
Comparison video: https://www.dropbox.com/s/tmkgtwvjp6vzjnr/panda-headings.mp4?raw=1